A few useful links of landscape, horticultural and ecological interest:

Association of Professional Landscape Designers
www.APLD.com

California Native Plant Society
www.cnps.org/

CalFlora, native plant database
www.calflora.org

The Permaculture Activist magazine
www.permacultureactivist.net

California Rare Fruit Growers, the largest amateur fruit-growing organization in the world
www.crfg.org

California Horticultural Society
www.calhortsociety.org

Mediterranean Garden Society
www.themediterraneangarden.org

California Society for Ecological Restoration
www.sercal.org